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- W762295426 abstract "Geophysical, hydrochemical and hydrogeological investigations wereundenaken to evaluate the groundwater prospects in the study area. The factors whichaffect/determine the spatial development of ground water in the area was also examined.The results show that the essential conditions for groundwater availability in hard rockterrains are satisfied. The average weathering depth is 34 m, rainfall is high and seasonaland the geological evolutionary sequence included tectonic phases during which suitablegeological structures are expected to have been developed. Analysis of borehole drillingrecords revealed that each borehole encountered at least one water strike. The claymineral stable in the prevailing physico-chemical conditions is kaolinite, an evidence thatweathering sites are being flushed presumably by flowing groundwater. Availableresults of isotope analysis also show that the stable isotope concentration in thegroundwater is similar to that of current meteoric water. It is therefore concluded that theground water is receiving current recharge. Infact water balance calculations and resultsof baseflow analysis indicate that this recharge is substantial.The yields of the boreholes varied greatly spatially ranging between 0.7 and 10.9I/s. This may be low compared with values quoted for sedimentary rock terrains, but inview of the present low level of water supply in the area, it is considered that exploitationof this resource would represent a significant improvement on the present situation.A physical catchment hydrogeological model is presented to explain the observedspatial variation in yields. In this model, a threshold elevation is considered to exist ineach catchment. At elevations below this threshold, borehole yield is sustained entirelyby fracture flow. At elevations above this threshold, borehole yield is sustained bystorage in the weathered rocks.Pumping tests on large diameter wells show that groundwater abstration usingthese wells would be greatly improved by repeated pumping after every 60 - 80 minutesrecovery. An equation is presented for calculating the number of times a well can berepeatedly pumped in an operating day.The drawdown of the boreholes contained a large well loss component. This wellloss was incurred during the early stages of pumping when water had to be withdrawnfrom well storage to supplement the aquifer flow in order to meet the pumping capacity.Field results presented indicated that the drawdown can be minimised by stepping thedischarge rather than imposing it all at once at the onset of pumping.Field results indicate that the use of well water levels for mapping the water tablemay not be valid in weathered hard rocks." @default.
- W762295426 created "2016-06-24" @default.
- W762295426 creator A5091609474 @default.
- W762295426 date "1989-01-01" @default.
- W762295426 modified "2023-09-24" @default.
- W762295426 title "Some aspects of the hydrogeology of the crystalline basement complex rocks of South Western Nigeria" @default.
- W762295426 hasPublicationYear "1989" @default.
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